A combination process for deep desulfurization and refining of liquefied petroleum gas

A technology for deep desulfurization of liquefied petroleum gas, applied in the petroleum industry, gas mixture processing, gas fuel, etc., can solve the problems of reducing sulfur content, unreached, alkali residue discharge, etc., and achieve high desulfurization depth and no waste alkali residue Emissions, low investment effect

Inactive Publication Date: 2016-05-11
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

In particular, most methods for removing mercaptans use oxidation (deodorization) to oxidize mercaptans to disulfides, which only removes the odor caused by mercaptans in liquefied gas, while the total sulfur of the product does not change , did not achieve the purpose of truly reducing the sulfur content, and there may also be the problem of alkali slag discharge

Method used

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  • A combination process for deep desulfurization and refining of liquefied petroleum gas
  • A combination process for deep desulfurization and refining of liquefied petroleum gas
  • A combination process for deep desulfurization and refining of liquefied petroleum gas

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Embodiment 1

[0031] Liquefied gas raw material A is mixed with dehydrogen sulfide agent B and then enters fixed bed reactor 1 filled with carbonyl sulfide hydrolysis catalyst, at a pressure of 0.5-3.0MPa, a temperature of 20-50°C, and a volume space velocity of liquefied gas of 2-10h -1 , hydrogen sulfide removal agent 0.2-1.0h -1 Under these conditions, the carbonyl sulfide hydrolysis reaction and the hydrogen sulfide removal process are simultaneously carried out, and the liquefied gas after the reaction enters the oil separation tank 2 to separate the liquefied gas from the desulfurizing agent, and the desulfurizing agent can be recycled to a certain extent and then regenerated; The liquefied gas enters the water washing tower to further remove the carried desulfurizer, and the liquefied gas enters the oil-water separation tank 4 for further dehydration after water washing. After washing with water, the liquefied gas is mixed with a certain amount of air and a sweetening activator, and ...

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Abstract

The invention relates to a deep desulfurization technology for liquefied petroleum gas. A carbonyl sulfate water-washing tower is adopted to remove hydrogen sulfate and carbonyl sulfate in the liquefied petroleum gas respectively according to different nature characteristics of sulfides contained in the liquefied petroleum gas, small-molecular mercaptan in the liquefied petroleum gas is converted into disulfides with higher boiling points through an oxidation tower, then the sulfides and a liquefied petroleum gas product are separated with a rectification method, sulfur-enriched C5 or heavy C4 components are arranged at the tower bottom, and the ultra-low-sulfur liquefied petroleum gas product is arranged at the tower top. The content of sulfur in the liquefied petroleum gas is decreased to be lower than 5 mu g / g in the process, the desulfurization rate is high, and no alkali residue is discharged.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and relates to a combined process method for petroleum refining and desulfurization and refining of by-product petroleum liquefied gas in chemical enterprises. Background technique [0002] Liquefied gas from catalytic cracking, delayed coking, hydrogenation and catalytic reforming devices in the petroleum refining process contains a large amount of sulfides, mainly including hydrogen sulfide, mercaptans, sulfides, carbonyl sulfide and disulfides, etc., their Existence will not only lead to a decline in product quality, but also seriously affect its performance, such as corrosion caused by the transportation and storage process, environmental pollution caused by the combustion process, etc. In particular, catalytic cracking and coking liquefied gas, which is used as a raw material for petrochemical processes (such as MTBE production, alkylation process and polypropylene process, et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G70/00C10L3/12
CPCC10G70/00C10G2300/202C10L3/12
Inventor 申志兵张君涛梁生荣
Owner XI'AN PETROLEUM UNIVERSITY
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